Rust

Implement mode function #49

Job	Run time
Check cargo fmt	40s
cargo check	10m 20s
build with wasm-pack	2m 30s
cargo test (macos)	10m 34s
cargo test (macos-aarch64)	9m 53s
Verify MSRV (Min Supported Rust Version)	7m 2s
Verify Vendored Code	54s
cargo test (win64)	46m 34s
cargo test (amd64)	9m 51s
cargo test datafusion-cli (amd64)	4m 2s
clippy	5m 44s
cargo doc	3m 53s
cargo test hash collisions (amd64)	14m 15s
check Cargo.toml formatting	2m 58s
cargo test doc (amd64)	15m 2s
cargo examples (amd64)	13m 20s
Run sqllogictest with Postgres runner	3m 36s
cargo test pyarrow (amd64)	2m 52s
verify benchmark results (amd64)	12m 1s
check configs.md is up-to-date	3m 4s
	2h 59m 5s

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